It's called "The Harley Tax". To meet EPA restrictions the really restrict the intake and exhaust flow. For years the cheapest 10% HP gain was a Screamin Eagle air filter, rejet/remap, and some free flowing exhaust. Not as easy on some of the new stuff.WOW! before i cut my baffles with the 1 1/4" hole saw I talked with my local Harley Tech and he told me that I sidnt need to remap or use a power commander. Being the trusting person I am I called 4 other and they all said the same thing. 3 of the 5 informed that the sportster computer can not be remaped beyond the factory settings anyway. And yes i used the saw to cut holes.